Bedienungsanleitung NAD T748v2 (Seite 20 von 40) (Englisch)

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SPEAKER CONFIGURATION

Every surround-sound system requires “bass-management” to direct low-

frequency content from any or all channels to the speakers best able to

reproduce it. For this function to operate correctly, it is important that you

correctly identify your speakers’ capabilities. We use the terms “Small” and

“Large” (and “O”) but note that physical size may be irrelevant.

• A “Small” speaker is any model, regardless of physical size, that lacks

signicant deep-bass response, that is, below about 150 Hz.

• A “Large” speaker is any full-range model; that is, one with deep-bass

response

• An “None” speaker is one that is not present in your system. For example,

you might not have any surround-back speakers installed; in that case,

you would set the “Back” setup item to “None”.

The Speaker Conguration is “global”; that is, it remains in force with all

inputs and in all listening modes. However, speaker settings are part of the

T 748’s A/V Preset system. Consequently, multiple speaker settings can be

stored for easy recall as dierent types of recordings or listening modes

require.

Speaker Conguration can be managed and adjusted by pressing a

combination of [ S ] and then [ D/F ] keys. Set “Front”, “Center”, “Surround”

and “Back” to “Large”, “Small” (“Small 60Hz” up to “Small 150Hz”) or “None” as

your subsystem’s speakers require.

Set “Subwoofer” to “On” or “O,” selecting “On” only if you have a subwoofer

connected to the T 748’s SUBW output jack. If the “Subwoofer” is set to “O”,

“Front” speaker will automatically be set to “Large”.

ENHANCED BASS

When the subwoofer is set to “On” and “Front” is set to “Large”, Enhanced

Bass becomes available. Normally, with speakers set to “Large” the

subwoofer is not active. The Enhanced Bass option allows full range

operation of the speakers with the additional bass contribution of the

subwoofer. This feature is particularly useful when one wants to experience

maximum bass output. Please note that due to acoustic cancellation

eects, the bass response may be uneven when using this setting

You can set Subwoofer to “On” even with “Large” front speakers, in which

case bass content from any channels set to “Small” will be routed to both

the subwoofer and to the front speakers; LFE-channel signal will pass only

to the sub. In most subwoofer-equipped systems, setting front speakers to

“Small” is usually the better option.

All the speakers’ low frequency content can be directly adjusted within the

range 60Hz to 150Hz.

NOTE

The congurations set forth at “Speaker Setup” are carried over

whenever it is enabled during A/V Presets setting. Please see also the

section “AV Presets Setup” for reference.

SPEAKER LEVELS

Adjusting the relative balance of your system’s loudspeakers ensures that

surround-sound recordings, whether music or lm, will present the balance

of eects, music, and dialog that the artists intended. Additionally, if your

system incorporates a subwoofer, it establishes a correct relationship

between the volume of the subwoofer and the other speakers, and thus of

low-frequencies (bass) to other sonic elements.

USING AN SPL METER

It is quite practical to perform the T 748 level setup routines “by ear,” and

careful work will produce acceptably accurate results. However, the use

of an inexpensive sound-pressure level (SPL) meter, such as Radio Shack

part number 33-2050, makes this task easier, more accurate and more

repeatable. Ownership of such a meter could prove a valuable audio tool.

The SPL meter should be placed at the primary listening position, at

approximately the height of the seated listener’s head. A tripod is helpful

but with a little duct tape almost anything - a pole lamp, music-stand,

or ladder-backed chair, for example - can do as well. Just be sure that no

large acoustically reective surfaces obstruct or are near the microphone

element.

Orient the meter with its microphone (usually at one end) pointing straight

up toward the ceiling (not toward the speakers) and ensure that “C”

weighting scale is selected. Set the meter to display 75 dB SPL. On Radio

Shack meters, this necessitates either setting the meter to its 80 dB range

and taking your readings at the -5 point or selecting the 70 dB range and

reading at the +5 point.

SETTING SPEAKER LEVELS AT TEST MODE

While at “Speaker Levels” menu, press the AVR 4 remote’s [TEST] key

activating the T 748’s Speaker Levels balancing test signal. You will hear a

“surf” sound as the test mode cycles through the speakers (“test” appears

to the right side of the current speaker), beginning with the Front Left. If

you do not hear the test signal, check your speaker connections or your

“Speaker Conguration” OSD menu settings.

Use the remote’s [ D/F ] keys to adjust the loudness of the noise output

from the currently playing channel to the required level (it’s usually simplest

to begin with the Front Left). As the test signal cycles around the speakers,

the OSD will highlight the currently playing channel. The “level oset”

reading on the right will change by 1 dB increments; ±12 dB adjustment is

available. Press [ENTER] to adjust the next speaker or for the Test mode to

continue on with the other speakers in sequence.

NOTE

If you are balancing levels “by ear”, choose one speaker - usually the

center - as a reference and adjust each of the others in turn to “sound as

loud” as the reference. Be sure that you remain in the primary listening

position while balancing all channels.

OPERATION

USING THE T 748  SETUP MENU

ENGLISH PORTUGUÊSFRANÇAIS ESPAÑOL ITALIANO DEUTSCH NEDERLANDS SVENSKA РУССКИЙ

NAD T748v2 Seite 20

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